Multifunctional Polypyrrole/Multi-Walled Carbon Nanotube Composite Material: Dielectric, Humidity Sensing and Broadband EMI Shielding Properties

Conducting polymer composites with suitable combination of two components in nanoscale are expected to facilitate wider applications of composites. In this study, polypyrrole (PPy)/multiwalled carbon nanotube (MWCNT) nanocomposites prepared by in situ chemical oxidative polymerization were character...

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Bibliographic Details
Published in:Polymer science. Series B 2021-05, Vol.63 (3), p.280-290
Main Authors: Madhusudhan, C. K., Mahendra, K., Madhukar, B. S., Somesh, T. E., Muhammad Faisal
Format: Article
Language:English
Subjects:
Broadband
Chemistry
Chemistry and Materials Science
Composite materials
Composites
Conducting polymers
Dielectric properties
Fourier transforms
Frequency ranges
Humidity
Impedance
Infrared spectroscopy
Multi wall carbon nanotubes
Nanocomposites
Polymer matrix composites
Polymer Sciences
Polypyrroles
Shielding
Spectrum analysis
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Summary:Conducting polymer composites with suitable combination of two components in nanoscale are expected to facilitate wider applications of composites. In this study, polypyrrole (PPy)/multiwalled carbon nanotube (MWCNT) nanocomposites prepared by in situ chemical oxidative polymerization were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and UV–Vis spectroscopy. The electrical and dielectric properties were investigated using complex impedance technique. Complex dielectric permittivity, complex electric modulus and complex impedance variations were studied in the frequency range of 10 Hz–1 MHz. The dielectric attributes and conductivity data of different nanocomposites analyzed as a function of frequency revealed that the incorporation of MWCNT phase into polypyrrole matrix affects the electrical and dielectric properties of the composites. Humidity sensor measurements show that PPy/MWCNT can be effectively optimized as candidate for humidity detection. The nanocomposites were also studied for broadband EMI shielding applications by characterizing the materials in the 12‒18 GHz (Ku band) to understand the shielding properties. The absorption dominant shielding effectiveness (SE) observed in the range of ‒13 to ‒15 dB was stable with visible variation with varying concentration of MWCNT in PPy. The experimental results of dielectric characterization, humidity sensing and EMI shielding response reveal that PPy/MWCNT composite can be suitable multifunctional material for various applications.
ISSN:1560-0904
1555-6123
DOI:10.1134/S156009042103009X